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Finding the Fourth Proportional to 13,591.80, 20,387.70 and 10,311.30

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Solution

The fourth proportional to 13,591.80, 20,387.70 and 10,311.30 is: 15,466.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,591.80 : 20,387.70 = 10,311.30 : x
  2. Step 2: Convert to fraction form
    13,591.80/20,387.70 = 10,311.30/x
  3. Step 3: Cross multiply
    13,591.80x = 20,387.70 × 10,311.30
  4. Step 4: Simplify right side
    13,591.80x = 210,223,691.01
  5. Step 5: Solve for x
    x = 210,223,691.01/13,591.80
  6. Step 6: Final answer
    x = 15,466.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.